From: Chuck Lever chuck.lever@oracle.com

mainline inclusion from mainline-v6.12-rc6 commit 63fab04cbd0f96191b6e5beedc3b643b01c15889 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB37AU CVE: CVE-2024-50241

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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Ensure the refcount and async_copies fields are initialized early. cleanup_async_copy() will reference these fields if an error occurs in nfsd4_copy(). If they are not correctly initialized, at the very least, a refcount underflow occurs.

Reported-by: Olga Kornievskaia okorniev@redhat.com Fixes: aadc3bbea163 ("NFSD: Limit the number of concurrent async COPY operations") Reviewed-by: Jeff Layton jlayton@kernel.org Tested-by: Olga Kornievskaia okorniev@redhat.com Signed-off-by: Chuck Lever chuck.lever@oracle.com

Conflicts: fs/nfsd/nfs4proc.c [Commit 8adb368675cf("[Backport] NFSD: Limit the number of concurrent async COPY operations") miss partial indent before "(int)rqstp->rq_pool->sp_nrthreads"] Signed-off-by: Li Lingfeng lilingfeng3@huawei.com --- fs/nfsd/nfs4proc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 9b672ba7d02b..34d9931df6a4 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1823,14 +1823,14 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, if (!async_copy) goto out_err; async_copy->cp_nn = nn; + INIT_LIST_HEAD(&async_copy->copies); + refcount_set(&async_copy->refcount, 1); /* Arbitrary cap on number of pending async copy operations */ if (atomic_inc_return(&nn->pending_async_copies) > (int)rqstp->rq_pool->sp_nrthreads) { atomic_dec(&nn->pending_async_copies); goto out_err; } - INIT_LIST_HEAD(&async_copy->copies); - refcount_set(&async_copy->refcount, 1); async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL); if (!async_copy->cp_src) goto out_err;